Radar signal detector

Details Radar signal detector Radar signal detector

1980-06-03

1982-02-09

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

375 92, 455227, G01S 728, G01S 736

Patent

active

043152619

ABSTRACT:
A sensitive radar signal detector is provided which is operative to reliably detect low level radar radiation characteristic of scattered radiation of very short duration and unknown frequency. Received radar signals which are mixed with a swept frequency signal are passed through to a narrow band FM descriminator, the output of which is amplified by a unidirectional amplifier. The output of the amplifier, present when a signal is received, is utilized to momentarily slow the frequency swept local oscillator resulting in a time expansion of the characteristic S-shaped descriminator output signal. This results in the generation of a negative-going error signal between the two time expanded halves of the S-shaped descriminator response. The error signal when amplified produces a significant voltage spike which ensures reliable detection, to permit the detection of a single radar pulse with a reduced false alarm rate.

REFERENCES:
patent: 3094663 (1963-06-01), Siegel
patent: 3257659 (1966-06-01), Siegel
patent: 3408574 (1968-10-01), Schmidt et al.
patent: 3550008 (1970-12-01), Bright
patent: 4181910 (1980-01-01), Hitterdal
patent: 4182990 (1980-01-01), Coffin et al.

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